Bobbin-holding device for lock-stitch sewing-machines.



W. G. MEYER. BOBBIN'HOLDING DEVIGE FOR LOCK STITCH SEWING MACHINES.

APPLICATION FILED AUG. 10, 1905.

1,08,565, Patented Dec. 31,1912.

' UNITED PATENT OFFICE.

, WILLIAM C. MEYER, OF BOSTON, MASSACHUSETTS, ASSIGNOR T UNITED SHOEMACHINERY COMPANY, OF PATERSON,

JERSEY.

NEWJERSEY, A CORPORATION OF NEW BOBBIN-HOLDING DEVICE FOR LOCK-STITCHSEWING-MACHINES.

Specification of Letters Patent.

Patented Dec. 31,1912.

Application filed August 16, 1905. Serial No. 274,356.

To all whom it may concern:

Be it known that LWVILLIAM C. MEYER, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented certain new and useful Improvements in Bobbin-HoldingDevices for Lock-Stitch Sewing-Machines; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

- provement in ferred to, is placed. loosely in the oscillatsupported ina ing shuttle and held there during the operation of the machine by abobbin holding arm which engages the face of the bobbin and prevents itsdisplacement. For convenience in removing and replacing the bobbin thebobbin holding arm is pivoted to a bolt bracket projected from the sideof the shuttle race. By tightening the nut on the bolt the bobbinholding arm is frietionally held in place. A leather. washer under thenut is relied upon to create the arm, thus swinging it away necessaryfriction to hold the bobbin arm from displacement in the operation ofthe machine. The construction constitutes an embodiment of the inventiondescribed-in the patent'to French and Meyer, No. 424,966, from theillustrated embodiment of which, however, it diiicrs in thatthe bolt is'extended upward through bracket on the frame and the nut on the upperend is provided with a handle. The nut and bolt are threaded left-hand,so that in turning the handle to loosen the nut, after the nut hasbecome slightly loosened, the

,friction between the parts is snflicient to enable the operator by ting of the handle to open the bobbin holding from the bobbin so that thebobbin may be removed from the shuttle. These means for operating thebobbin holding arm to open and close it and to hold it closed have beenfound ineffective owing to the act that the operation of the bobbinholding arm and the holding of it in place depended upon frictionbetween the parts, and much ditiiculty has been exerienced with thisdevice in the use of the Rapid stitcher owing to these facts.

The objects of the present invention are to reorganize and improve theconstruction and operation of bobbin holding means in order to securepositively acting mechanism for opening and closing the bobbin holdingarm and for positively holding said arm in closed position.

To the above ends the present invention consists in the devices andcombinations of devices hereinafter described and particularly definedin the claims.

In the accompanying drawings illustrating the preferred form of theinvention Figure 1 is a front elevation of the shuttle race and bobbinholding means. Fig. 2 is a plan of the same, the parts being shown asadapted to be incorporated in the machine of said Patent No. 473,870, towhich for a description of the parts not hereinafter mentioned,reference may be had, and Fig. 3 is a plan of a portion of-the bobbinholding arm and its operating means.

The shuttle race 1, adapted to receive the shuttle and within theshuttle the bobbin, is substantially the same as in said patentedmachine. The bobbin holding arm 2 is the arm and the,

ne continued turnpivotally mounted upon the bolt 3 whicl'rfis secured ina projection from the shuttle race. A stop screw 4 provided with a setnut is screwed through a threaded aperture in the bobbin holding arm andis adapted to engage the periphery of the shuttle race and to limit themovement ofth'c bobbin holding arm toward the bobbin soas to allowsulfieicnt clearance between the bobbin and bobbin holding arm to permitthe free movement of the bobbin and the passage of the thread betweenthe parts.

Means are provided for opening and closing the'bobbin holding arm andfor looking it in its closed position. To this end the bobbin holdingarm is provided with a tooth or projection 5 which is adapted to enter anotch 6 in the cam 7 which is-secured to'the hand wheel shaft 8. Thehand wheel shaft 8 is carried in a bracket 9 supported from the head ofthe machine and carries upon its upper end the hand wheel 10 which isalso secured thereto. This construction is such that when the hand wheel10 is turned to the left the shoulder 11 of the cam 7 engages theprojection of the bobbin holding arm2 and swings the bobbin holding armfrom the position shown in Fig. 2 to the position shown in. Fig; 3. A

- stop 12 upon the bobbin holding arm limits spiral peripheral surfaceof the cam 7 acts been swung into the this opening movement of thebobbin holding arm. The peripheral surface of the cam 7 is spiralinishape, the shoulder 13 being somewhat nearer the center of the handwheel shaft. 8 -thanthe shoulder 11. 'When it is desired to close thebobbin holding arm or to-turn it from the position in which it is shownin Fig. 3 to the'position in which it is shown in Fig; 2, the hand wheel10 is turned to the right whereupon the shoulder 13 strikes "theprojection 5 and thereby turns the bobbin holding arin about the bolt 3into the operative or closed position. The

as a wedge to force the-projection 5 in the direction to move-the bobbinholding arm toward theab obbin until it brings the stop 4 against theperiphery of the shuttle race. Therefore after the bobbin holding armhas position shown in Fig,

2 it looks the bobbin holding arm against position.

holding it positively in operative It ,willbe observed that in thisconstruction the mechanism for operating the bobbin] holder operatespositively (simply as distinguished from frictionally) op n .to move thebobbin holding arm to open and close the same. v

It 'is not intended in this application to claim broadly the combinationwith a bobbin of a bobbin holding. arm mounted to swin engage andpositively hold the bobbinzholding arm inoperative position, asthat-constru'ction forms the subject-matter of the copending applicationof Joseph;E Thayer.

I filed February 15, 1905, Serial No. 245,697,

- which is adapted to to which by permission reference is bad. It is to'be understood that" while in the claims abobbin isreferred to as thedevice be held inplace by the bobbi'n holding arm, the invention is notthe contemplation I the construction to limited to the use ofa-bobbin asit is within sewing machines in which the entire shuttle is heldposition prising a notched spiral 'faced cam the ing the toward and fromthe bobbin and a latch to of the'invention to apply shoulders ofthenotch operating by engagein combination, a pivotally-mounted bobbinholding arm for holding the bobbin in place,

dGXlCG for v a manually operable rotatable 'swingingthe arm into and outof operative position about its pivotal support, and connections betweenthe arm and the rotatable device arranged and constructed to lock thearm in operative position,substantially as described. a

3.., A look stitch sewing machine,'having,

in combination, a bobbin, a'normally stationary" bobbin holding armmovable from closed to open position for holding the bob bin in place,and. mechanism including a normally stationary cam engaging the bob-.-bin holding arm for moving the arm.-

, 41 A look stitch sewing. machine, having, in combination, a bobbin, anormally'stationary bobbin holding arm movable from open to closedposition for holding the bobbin in place, andv mechanism including anormally stationary actuating and locking cam engaging the bobbinholding-arm and arranged to move the bobbin I holding arm' and lock itin closed position 5. A look stitch sewingmachine,' having combination,a bobbin, a normally stationary bobbin holding arm for holding thebobbin in place,-'a nd mechanism for moving -thefarm toward and from itsclosed position including a normally stationary cam engagarm and actingto lock the arm in closed position.

6. A lockstitch sewing machine, having, I

in combination, a bobbin,

tending transversely of the plane: of movementof the arm,

.tionary movable cam arranged to engage the arm on the opposite side ofthe pivot from the bobbin and lock the arm inclosed posi- Intestimonywhereof lafiix my signature, in-.;pre'sence;of.two witnesses.

. a WILLIAM enema I Copies of this patent may be obtained forflve centseach. by-adaressmg the fcommisaioner of Patents, I i [Washington .D. C."I

a pivotally mount-u ed bobbimholding \arm,'arotary shaft ex-- and anormally stationary cam carriedby the shaft arranged to engage" theopposite side of the pivot from the bobbin'and lock 'thevarm in closedhaving,

